diff -up mate-desktop/libmate-desktop/mate-desktop-thumbnail.c~ mate-desktop/libmate-desktop/mate-desktop-thumbnail.c
--- mate-desktop/libmate-desktop/mate-desktop-thumbnail.c~	2022-09-27 16:53:40.943355497 +0200
+++ mate-desktop/libmate-desktop/mate-desktop-thumbnail.c	2022-09-27 16:53:40.960355614 +0200
@@ -150,6 +150,21 @@ thumbnailer_load (Thumbnailer *thumb)
 
   thumb->try_exec = g_key_file_get_string (key_file, THUMBNAILER_ENTRY_GROUP, "TryExec", NULL);
 
+  if (thumb->try_exec != NULL)
+    {
+      gchar *path_to_exec = g_find_program_in_path (thumb->try_exec);
+
+      if (path_to_exec == NULL)
+        {
+          g_message ("Ignoring thumbnailer with missing binary: '%s'", thumb->try_exec);
+          thumbnailer_unref (thumb);
+          g_key_file_free (key_file);
+          return NULL;
+        }
+
+      g_free (path_to_exec);
+    }
+
   g_key_file_free (key_file);
 
   return thumb;